Hi All, I have a need to create an interface box to an existing system which basically takes two hall effect inputs (wheel pickups) and outputs the fastest wheel speed, which can then be wired into both input channels of the existing control box. The existing control box has two hall effect wheel speed inputs however I need to provide only the fastest of the two wheel speeds to both inputs.
Measurement of current pulse train with a scope shows a square wave from 0 to 500 Hz and (IIRC) a high and low of 8v and 0.5 volts respectively.
My three thoughts were along the lines of using :
a) some form of frequency comparator circuit,
b) a pair of LM2907/2917's FTV (based on the "select high" circuit in LM2907/2917 datasheet) followed by VTF to generate the output signal.
c) use a PIC microcontroller to read the sensors, calculate fastest frequency and output fastest frequency.
Ideally I'd like a solid state solution, rather then PIC based solution.
Is there any such device already available ?
Thanks in advance
Measurement of current pulse train with a scope shows a square wave from 0 to 500 Hz and (IIRC) a high and low of 8v and 0.5 volts respectively.
My three thoughts were along the lines of using :
a) some form of frequency comparator circuit,
b) a pair of LM2907/2917's FTV (based on the "select high" circuit in LM2907/2917 datasheet) followed by VTF to generate the output signal.
c) use a PIC microcontroller to read the sensors, calculate fastest frequency and output fastest frequency.
Ideally I'd like a solid state solution, rather then PIC based solution.
Is there any such device already available ?
Thanks in advance